Writing instrument



FIG. 1 is a perspective view of a writing instrument showing our new design;

FIG. 2 is front view of the same;

FIG. 3 is a rear view of the same;

FIG. 4 is a top view of the same;

FIG. 5 is a right side view of the same; and,

FIG. 6 is a left side view of the same.

Portions of the writing instrument shown in broken lines are for illustrative purposes only, and form no part of the claimed design. 

We claim the ornamental design for a writing instrument, as shown and described. 